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posix-timers: Make posix_clocks immutable

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There are no more modular users providing a posix clock. The register
function is now pointless so the posix clock array can be initialized
statically at compile time and the array including the various k_clock
structs can be marked 'const'.

Inspired by changes in the Grsecurity patch set, but done proper.

[ tglx: Massaged changelog and fixed the POSIX_TIMER=n case ]

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Mike Travis <mike.travis@hpe.com>
Cc: Dimitri Sivanich <sivanich@hpe.com>
Link: http://lkml.kernel.org/r/20170526090311.3377-3-hch@lst.de
This commit is contained in:
Christoph Hellwig 2017-05-26 12:03:11 +03:00 • committed by Thomas Gleixner
parent 07903ada96
commit d3ba5a9a34
5 changed files with 151 additions and 174 deletions
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9
include/linux/posix-timers.h
View file

@ -105,10 +105,11 @@ struct k_clock {
struct itimerspec64 *cur_setting);
};
extern struct k_clock clock_posix_cpu;
extern struct k_clock clock_posix_dynamic;
void posix_timers_register_clock(const clockid_t clock_id, struct k_clock *new_clock);
extern const struct k_clock clock_posix_cpu;
extern const struct k_clock clock_posix_dynamic;
extern const struct k_clock clock_process;
extern const struct k_clock clock_thread;
extern const struct k_clock alarm_clock;
/* function to call to trigger timer event */
int posix_timer_event(struct k_itimer *timr, int si_private);